Disentangling the Effects of Mating Propensity and Mating Choice in Drosophila

Casares, P.; Carracedo, Maria C.; Río, Beatriz del; Piñeiro, R.; García‐Flórez, Lucía; Barros, A.R.

doi:10.2307/2410927

Cited by 27 publications

(19 citation statements)

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“…Our mate choice protocol avoided some of the potential confounds that have been noted in related systems (e.g. see Arnold et al ., 1996; Casares et al ., 1998). First, we avoided the potential depletion of males from the mating pool (see Casares et al ., 1998).…”

Section: Phase I: Establishment Of Populationsmentioning

confidence: 99%

A direct experimental test of founder-flush effects on the evolutionary potential for assortative mating

Regan

Meffert

Bryant

2003

Journal of Evolutionary Biology

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Founder-flush speciation models propose that population bottlenecks can enhance evolutionary potential for reproductive isolation. To test this prediction, we subjected bottlenecked (three-pair founder-flush) and nonbottlenecked populations of the housefly to 18 generations of selection for assortative mating. After the selection regime, we analysed videotaped courtship bouts in these lines to identify correlated responses to the selection protocol. The realized heritabilities for assortative mating for both the bottlenecked and nonbottlenecked treatments were very low, but still significant. The founder-flush populations had thus responded to selection as well as the nonbottlenecked populations, although not significantly greater (i.e. total increases in assortative mating were 9.6 and 8.6%, respectively). Multivariate analyses on the courtship repertoires found that, although both bottlenecked and nonbottlenecked treatments attained similar levels of assortative mating, the treatments exhibited different evolutionary solutions in their correlated responses. Specifically, the bottlenecked lines demonstrated a significantly more diverse set of evolutionary trajectories (i.e. significant shifts along the second principal component for courtship). This suggests that the bottlenecked lines had greater potential for the evolution of novel phenotypes as predicted by founder-induced speciation models. Our results, however, cannot distinguish whether the more variable evolutionary responses resulted from increased heritabilities in courtship components, reduced potential to follow the convergent evolutionary trajectories noted for the nonbottlenecked lines, or some combination of both general processes in determining the resultant multivariate phenotype.

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Section: Phase I: Establishment Of Populationsmentioning

confidence: 99%

A direct experimental test of founder-flush effects on the evolutionary potential for assortative mating

Regan

Meffert

Bryant

2003

Journal of Evolutionary Biology

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“…The copulating pairs were aspirated out of the cage for identification by the food coloring in the guts. We let the mating trials run for 1 hour or until 60 matings (50% of possible copulations) had occurred, whichever came first (as recommended by [56] to avoid bias). Several comparisons were replicated at least three times to determine overall reliability in the mating behavior.…”

Section: Methodsmentioning

confidence: 99%

Incompatibility and Competitive Exclusion of Genomic Segments between Sibling Drosophila Species

et al. 2012

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The extent and nature of genetic incompatibilities between incipient races and sibling species is of fundamental importance to our view of speciation. However, with the exception of hybrid inviability and sterility factors, little is known about the extent of other, more subtle genetic incompatibilities between incipient species. Here we experimentally demonstrate the prevalence of such genetic incompatibilities between two young allopatric sibling species, Drosophila simulans and D. sechellia. Our experiments took advantage of 12 introgression lines that carried random introgressed D. sechellia segments in different parts of the D. simulans genome. First, we found that these introgression lines did not show any measurable sterility or inviability effects. To study if these sechellia introgressions in a simulans background contained other fitness consequences, we competed and genetically tracked the marked alleles within each introgression against the wild-type alleles for 20 generations. Strikingly, all marked D. sechellia introgression alleles rapidly decreased in frequency in only 6 to 7 generations. We then developed computer simulations to model our competition results. These simulations indicated that selection against D. sechellia introgression alleles was high (average s = 0.43) and that the marker alleles and the incompatible alleles did not separate in 78% of the introgressions. The latter result likely implies that most introgressions contain multiple genetic incompatibilities. Thus, this study reveals that, even at early stages of speciation, many parts of the genome diverge to a point where introducing foreign elements has detrimental fitness consequences, but which cannot be seen using standard sterility and inviability assays.

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“…We conducted tests until we had collected data for about 100 pairs per comparison, or at least five tests per comparison. By scoring only 20 pairs in each group of 160 flies, we hoped to keep the sampling variances approximately the same during the test, so that all individuals had a high probability of encountering flies of the other genotype (Casares et al ., 1998 recommend that no more than the first 50% of mating pairs be scored, so our methods were conservative). Each fly was tested just once.…”

Section: Tests Of Behavioural Isolationmentioning

confidence: 99%

Forty years of solitude: life-history divergence and behavioural isolation between laboratory lines of Drosophila melanogaster

Boake

McDonald

Maitra

et al. 2003

Journal of Evolutionary Biology

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The study of the early stages of speciation can benefit from examination of differences between populations of known history that have been separated for a short time, such as a few thousands of generations. We asked whether two lines of Drosophila melanogaster that were isolated more than 40 years ago have evolved differences in life-history characters, or have begun to evolve behavioural or postzygotic isolation. One line, which is resistant to DDT, showed lower egg production and a shorter lifespan than a susceptible line. These differences are not a pleiotropic effect of resistance because they are not attributable to the chromosome that contains the resistance factors. The two lines have begun to become behaviourally isolated. Again, the isolation is not attributable to genes on the chromosome that contains resistance factors. The lines show only prezygotic isolation; there is no evidence of reduced fitness of F1 or F2 hybrids. These lines and others like them, should be excellent subjects for analyses of genetic changes that could lead to speciation.

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Disentangling the Effects of Mating Propensity and Mating Choice in Drosophila

Cited by 27 publications

References 0 publications

A direct experimental test of founder-flush effects on the evolutionary potential for assortative mating

A direct experimental test of founder-flush effects on the evolutionary potential for assortative mating

Incompatibility and Competitive Exclusion of Genomic Segments between Sibling Drosophila Species

Forty years of solitude: life-history divergence and behavioural isolation between laboratory lines of Drosophila melanogaster

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